$OpenBSD: patch-libavcodec_aacenc_quantization_misc_h,v 1.2 2016/03/09 17:29:36 ajacoutot Exp $

AAC encoder: memoize quantize_band_cost

aacenc: use generational cache instead of resetting.

--- libavcodec/aacenc_quantization_misc.h.orig	Tue Mar  8 19:20:55 2016
+++ libavcodec/aacenc_quantization_misc.h	Tue Mar  8 19:23:47 2016
@@ -0,0 +1,53 @@
+/*
+ * AAC encoder quantization
+ * Copyright (C) 2015 Claudio Freire
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * AAC encoder quantization misc reusable function templates
+ * @author Claudio Freire ( klaussfreire gmail com )
+ */
+
+#ifndef AVCODEC_AACENC_QUANTIZATION_MISC_H
+#define AVCODEC_AACENC_QUANTIZATION_MISC_H
+
+static inline float quantize_band_cost_cached(struct AACEncContext *s, int w, int g, const float *in,
+                                const float *scaled, int size, int scale_idx,
+                                int cb, const float lambda, const float uplim,
+                                int *bits, float *energy, int rtz)
+{
+    AACQuantizeBandCostCacheEntry *entry;
+    av_assert1(scale_idx >= 0 && scale_idx < 256);
+    entry = &s->quantize_band_cost_cache[scale_idx][w*16+g];
+    if (entry->generation != s->quantize_band_cost_cache_generation || entry->cb != cb || entry->rtz != rtz) {
+        entry->rd = quantize_band_cost(s, in, scaled, size, scale_idx,
+                                       cb, lambda, uplim, &entry->bits, &entry->energy, rtz);
+        entry->cb = cb;
+        entry->rtz = rtz;
+        entry->generation = s->quantize_band_cost_cache_generation;
+    }
+    if (bits)
+        *bits = entry->bits;
+    if (energy)
+        *energy = entry->energy;
+    return entry->rd;
+}
+
+#endif /* AVCODEC_AACENC_QUANTIZATION_MISC_H */
